A Trio Sonata typically:
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made use of 3 melodic lines: A trio sonata generally consists of two upper melodic instruments (often violins or flutes) and a basso continuo (usually consisting of a keyboard instrument along with a bass instrument), which supports the harmony but is not considered a melodic line.
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was composed for 3 musicians: This is a common format, as two players play the upper parts, and one player performs the continuo part.
However, it is important to note that while these two statements are correct, they do not imply the other options:
- A trio sonata did use basso continuo.
- It was not always composed in 3/4 time; it could be in various time signatures.
So the correct options are that it made use of 3 melodic lines and was composed for 3 musicians.